Ms Nilsson was charged with murder after police discovered that the data from the smartwatch Myrna Nilsson was wearing allegedly put her time of death at odds with her daughter-in-law's version of events.

A prosecutor previously told the Adelaide Magistrates Court that the Apple Watch was a "foundational piece of evidence".

Ms Matteo said the evidence supported the allegation Ms Nilsson staged a home invasion to conceal her involvement in the death of her mother-in-law.

"The evidence from the Apple Watch is a foundational piece of evidence for demonstrating the falsity of the defendant's account to police," Ms Matteo said.

"A watch of this type … contains sensors capable of tracking the movement and rate of movement of the person wearing it and it keeps a history of the wearer's daily activity, it also measures the heart rate."

Ms Matteo told the court the data showed activity consistent with Myrna Nilsson being ambushed and attacked as she walked into her home just after 6:30pm.

She said it then showed activity and heart rate measurements consistent with her body going into shock and losing consciousness.

"The deceased must have been attacked at around 6:38pm and had certainly died by 6:45pm," she said.

"If that evidence is accepted, it tends to contradict the accused's version of an argument occurring between the deceased and these men outside the laundry for a period of up to 20 minutes."

DNA evidence also did not support Ms Nilsson's version of events that attackers had been in the home, the prosecutor said.

Victim's son urged court to release wife

Ms Nilsson's husband, Mark Nilsson, has previously pleaded to Justice Greg Park to release his wife from custody as she was the main carer of their three children, aged five, six and three.